Electrum 4.0.3 upgrade and 1.0 release

[MrNaif2018]

This PR makes necessary changes to SDK to work with electrum 4.0
Daemon PR: bitcart/bitcart#123

Some changes in SDK in this PR:

• onchain_history now doesn't need to be json.load'ed, this bug was fixed. SDK update will make it seamless
• addinvoice renamed to add_invoice (breaking)
• poll_updates timeout before re-fetching new updates decreased from 2 to 1 second

Breaking changes since last electrum version, documented here:

• pay_to/pay_to_many, with broadcast=False now returns str instead of a dict, removing redundant keys. It now returns raw transaction directly.
• add_invoice now returns a dictionary instead of str
  Before it returned lightning invoice itself, now it returns payment request dict for lightning, where invoice is in invoice key
  dict structure:

  {
      "is_lightning": True,
      "amount_BTC": "0.5",
      "message": "test description",
      "expiration": 3600,
      "status": 0,
      "status_str": "Expires in about 1 hour",
      "amount_msat": 50000000000,
      "can_receive": False,
  }
  

  plus timestamp key (int), rhash (str) and invoice (str)
• On non-segwit wallets, errors.LightningUnsupportedError will be raised now
• add_request/get_request structure changed:
  • memo key renamed to message (payment request description)
  • amount key to amount_sat (amount in satoshis)
  • new is_lightning key, which will be False on payment requests
• get_tx output format changed:
  • removed partial and segwit_ser keys
  • lockTime renamed to locktime
  • inputs format changes:
    • added coinbase key (bool)
    • renamed sequence to nsequence
    • removed type, address and num_sig keys
  • outputs format changes:
    • scriptPubKey renamed to scriptpubkey
    • value renamed to value_sats
    • removed prevout_n and type keys
• list_channels output format changed:
  • items are now ordered, last channel is last in the list
  • channel format changes:
    • channel_id renamed to short_channel_id
    • full_channel_id renamed to channel_id
    • added new peer_state key (str)
    • removed local_htlcs and remote_htlcs
    • added local_reserve (int), remote_reserve (int), local_unsettled_sent (int) and remote_unsettled_sent (int) keys
• lnpay output changed:
  • It doesn't raise NoPathFoundError or any other errors anymore
  • It now returns a dict with keys success (bool), preimage (Optional[str]) and log (list of lists of strings)

Some current issues:

• After many pay_to, open_channel seems to be not working at all, large sleep interval > 5 seconds is needed. It returns insufficient funds even when there are enough funds. (done)
• close_channel raises error Failed to verify our signature, only force-close works. (done)

TODO:

• Create a changelog by using this compare url

[codecov]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #17   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          336       330    -6     
=========================================
- Hits           336       330    -6     

Impacted Files	Coverage Δ
bitcart/errors.py	100.00% <ø> (ø)
bitcart/coins/btc.py	100.00% <100.00%> (ø)
bitcart/event_delivery.py	100.00% <100.00%> (ø)

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[MrNaif2018]

Breaking changes since last electrum version, documented here (for changelog):

• pay_to/pay_to_many, with broadcast=False now returns str instead of a dict, removing redundant keys. It now returns raw transaction directly.
• add_invoice now returns a dictionary instead of str
  Before it returned lightning invoice itself, now it returns payment request dict for lightning, where invoice is in invoice key
  dict structure:

  {
      "is_lightning": True,
      "amount_BTC": "0.5",
      "message": "test description",
      "expiration": 3600,
      "status": 0,
      "status_str": "Expires in about 1 hour",
      "amount_msat": 50000000000,
      "can_receive": False,
  }
  

  plus timestamp key (int), rhash (str) and invoice (str)
• On non-segwit wallets, errors.LightningUnsupportedError will be raised now
• add_request/get_request structure changed:
  • memo key renamed to message (payment request description)
  • amount key to amount_sat (amount in satoshis)
  • new is_lightning key, which will be False on payment requests
• get_tx output format changed:
  • removed partial and segwit_ser keys
  • lockTime renamed to locktime
  • inputs format changes:
    • added coinbase key (bool)
    • renamed sequence to nsequence
    • removed type, address and num_sig keys
  • outputs format changes:
    • scriptPubKey renamed to scriptpubkey
    • value renamed to value_sats
    • removed prevout_n and type keys
• list_channels output format changed:
  • items are now ordered, last channel is last in the list
  • channel format changes:
    • channel_id renamed to short_channel_id
    • full_channel_id renamed to channel_id
    • added new peer_state key (str)
    • removed local_htlcs and remote_htlcs
    • added local_reserve (int), remote_reserve (int), local_unsettled_sent (int) and remote_unsettled_sent (int) keys
• lnpay output changed:
  • It doesn't raise NoPathFoundError or any other errors anymore
  • It now returns a dict with keys success (bool), preimage (Optional[str]) and log (list of lists of strings)